Worcester boiler troubleshooting

The brand boilers Worcester from England are not only fashionable products of one of the leading European countries, but the most real movement in tune with the times. The troubleshooting system represented below in form of a table meets the requirements of time. It will help to conduct diagnostics and prescribe repairs if it is necessary.

Worcester CDi Combi N.G boiler troubleshooting

FaultCauseRemedy
Required room temperature not achieved.Thermostatic valve(s) set too low.Set thermostatic valve(s) higher.
Minimum outside temperature setting too low.Adjust minimum outside temperature setting.
Heating curve set too low."Heating levels” for "Comfort” - Correct heating curve.
Flow temperature controller on the boiler set too low.Set the flow temperature controller higher.
Reduce influence of solar optimisation if necessary.
Air in the heating system.Bleed radiators and vent the heating system.
Room temperature offset set incorrectlyPerform adjustment to room temperature sensor and correct Room temperature offset.
The boilers holiday function is active.Deactivate the boilers holiday function.
Heating up takes too long."Heating up speed” set too low.Set "Heating up speed” e. g. to "Fast”.
Flow temperature from boiler too low, radiators too cool.Minimum outside temperature setting too low.Adjust minimum outside temperature setting.
Required room temperature greatly exceeded.Radiators become too hot.Set thermostatic valve(s) lower.
“Heating levels” for "Comfort” or ask your installer to correct heating curve.
FW 100 installed in an unfavourable location, e.g. external wall, near windows, in a draught,Select a better location for FW 100 and ask your heating engineer to reposition it.
Room temperature offset set incorrectlyPerform adjustment to room temperature sensor and correct Room temperature offset.
Excessive room temperature fluctuations.Temporary influence of external heat on the room, e.g. through solar radiation, lighting, TV, fireplace etc.Increase “Room influence”.
Select a better location for FW 100.
Temperature rises instead of falling.Clock time incorrectly set.Check time setting.
Room temperature too high during "Economy” and/or “Frost” mode.The building retains a lot of heat.Set an earlier switching time for "Economy” and/ or "Frost”.
Incorrect or no control.BUS connection or BUS subscriber faulty.Check the BUS connection against the wiring diagram and correct it if required.
Controller can only be set to automatic mode.Mode selector faulty.Have FW 100 replaced by your installer.
Domestic hot water cylinder does not heat up.Domestic hot water temperature control on boiler set too low.Set domestic hot water temperature control higher.
Reduce influence of solar optimisation if necessary.
Flow temperature controller on the boiler set too low.Turn the flow temperature control on the boiler clockwise as far as it will go.
Domestic hot water programme fault.Check/correct programme.
Incorrect System configuration for domestic hot water system.Correct the configuration to match the domestic hot water system connected.

Worcester Greenstar 24i Junior boiler troubleshooting

ProblemCauseRemedy
Desired room temperature is not reachedThermostatic radiator valve(s) set too low* Increase thermostatic radiator valve setting(s)
Temperature control for central heating flow on boiler set too low* Increase central heating flow temperature control setting
Air trapped in heating system* Bleed radiators and recharge heating system
Desired room temperature exceeded by large amountRadiators are too hot* Turn down thermostatic radiator valves/room thermostat
* Reduce central heating temperature by turning down the Central Heating control on boiler
Heating stays on for too longClock is incorrectly set* Check setting and adjust
No ON/OFF mains indicatorMomentary power failure* Switch off boiler at master switch, wait a few seconds then switch on again
Hot water temperature too lowTemperature set too low* Check setting and adjust
Water flow at tap too high* Reduce flow rate at tap
Hot water temperature too highTemperature set too high* Check setting and adjust
Water flow at tap too low* Increase flow rate at tap

Error codes and troubleshooting